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Cron to run first day of month to calculate date 3 months ago

 
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Old 05-17-2007
Cron to run first day of month to calculate date 3 months ago
Hi,

I would like to find out how can i calculate a date which is 3 months ago. I intend to run a cron job on the 1st of every month, and calculate the month 4 months earlier from the date. For example, if today's date is 1st May 2007, i would like to return 012007( January 2007).
i can get today's date by
Code:
'date +%Y%m%d`

is there a similar one liner or a few lines to achieve my result? would appreciate if anyone can shed some light. Thank you.
 
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LEARN ABOUT DEBIAN

xcalpr

XCALPR(1)						      General Commands Manual							 XCALPR(1)

NAME

       xcalpr - print xcal calendar entries

SYNTAX

       xcalpr [ -c ][ -x ][ -f file ][ -d dir ][ -u user ][ date-spec ]

DESCRIPTION

       Xcalpr prints the contents of the xcal files.  It is intended to be used in situations when you have no access to an X screen.  It can also
       be used to generate entries for the standard UNIX calendar program.

       With no arguments, it prints any entries that exist for the next seven days.  The program also reads the contents of the seven daily  files
       and  prints them at the appropriate point in the output stream.	Each line in the output is preceded by the day of the week, the day of the
       month, the month and the year.

       Xcalpr can be given a date specification to select months and years.  If the date spec consists of just a year number, then  all  the  data
       for that year is printed.  For example:
	    xcalpr 1994
       will print all the data for 1994.  Several years can be specified.

       If  you	give the name of a month, then the data for that month in the current year will be printed.  If the month is in the past, then the
       data for that month next year will be printed.  For example, if
	    xcalpr oct jan
       is typed in August, xcalpr will print October in the current year and January next year.

       You can select a particular year by adding the number after any months that you need printing:
	    xcalpr oct nov 1994
       will print October and November in 1994.

       There are a couple of special `month' names.  The name rest will print the data for the rest of the month,  starting  tomorrow.	 The  rest
       argument is not recognised if you give a year as a parameter.  If tomorrow happens to be the first day of the next month, then all the data
       for next month will be printed.	The name next prints all the data for next month.

OPTIONS

       The -c option causes xcalpr to output lines suitable for input to the standard UNIX calendar program.

       The -d switch is followed by a directory name and specifies an alterative location for your Calendar directory.	 Your  home  directory	is
       prepended if the name doesn't start with a slash or a dot.

       The -f option is followed by a file name and xcalpr will write it's output to that file, rather than standard output.

       The -u option is followed by a user name and dumps their calendar files rather than yours.

       The -x option makes xcalev operate with Calendar files that are compatible with the xcalendar program.

FILES

       $HOME/Calendar/*

       xc<dd><Mon><Year>  A data file is day, Month in three letter format and the year.

       xy<Year> 	  A year directory.

       xw<Day>		  A data file for the weekly code, one per day.

SEE ALSO

       xcal(1), xcalev(1), xcal_cal(1)

AUTHOR

       Copyright 1993 by Peter Collinson, Hillside Systems All rights reserved.

       This product includes software developed by the University of California, Berkeley and its contributors.

X Version 11 R5 						   October 1993 							 XCALPR(1)